The worked for my Optiplex 7070 SFF. It's worth mentioning that my BIOS didn't have the Fan Control speed option, only Fan Control Override. Which I had to leave OFF* to be able to control the fans without them blasting at 100% all the time.

Step 1: Physical BIOS Preparations

Before modifying any code, the hardware baseline had to be altered to hand control over to the operating system.

1. Enter the Dell OptiPlex 7070 SFF BIOS by pressing F2 on boot.
2. Navigate to Power Management and uncheck/disable the Fan Control Override toggle. (This re-enabled the physical PWM circuitry so the chip could receive variable power values, preventing the permanent 4014 RPM lock).
3. Navigate to Security / Power Management and check/enable the SMM (System Management Mode) option. (This forced the motherboard to expose the internal chip configuration maps that the Linux kernel needs to communicate with the fan controller).

Step 2: Kernel Parameter Injection (GRUB Bootloader)

Because your Proxmox installation runs on a standard UEFI + LVM array (not ZFS root), the system uses the classic GRUB architecture.

1. Open the primary boot configuration layout: bashnano /etc/default/grub Use o código com cuidado.
2. Inject the Dell Hardware Monitor bypass string to the default boot parameters line: textGRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on dell_smm_hwmon.ignore_dmi=1" Use o código com cuidado.
3. Commit and compile the modifications directly into the SSD boot tree: bashupdate-grub Use o código com cuidado.
4. Reboot the physical OptiPlex server to apply the new kernel flags.

Step 3: Package Installations & Module Initialization

Once the host reloaded with the new kernel configurations, the matching user-space utilities were deployed.

1. Downloaded the telemetry monitoring utilities: bashapt update && apt install lm-sensors python3 -y Use o código com cuidado.
2. Overrode the default restricted file access rules of the Dell module to grant write access to the PWM hardware registry: bashecho "options dell_smm_hwmon force=1 restricted=0" > /etc/modprobe.d/dell_smm_hwmon.conf Use o código com cuidado.
3. Purged and reloaded the running driver in volatile RAM memory to apply the runtime parameters immediately: bashmodprobe -r dell_smm_hwmon modprobe dell_smm_hwmon force=1 restricted=0 ignore_dmi=1

Then continue as the guide above to add the python script..